Track and Structures
Track Rehabilitation ($539.3 Million)
As part of the track rehabilitation capital program, Metro rehabilitates ma- jor sections of the rail system (routine maintenance is addressed through the operating program). Track work occurs during off-peak hours (evenings and weekends) and when the system is closed. This rehabilitation work includes replacing turnouts that allow trains to switch from one track to another (30/ year), running rail (52,800 feet/year, or 10 miles/year), direct fixation fasten- ers (16,000/year), cross ties (8,000/year) and third rail insulators (5,000/year). Metro replaces components when they become worn or unserviceable due to deterioration, excessive wear, or defects. In addition, track rehabilitation proj- e c t s u p g r a d e t h e p e r f o r m a n c e o f t h e t r a c k u s i n g n e w t e c h n o l o g i e s , p r o c e s s e s
and equipment. For example, as the third rail is being replaced, a new alumi-
num and steel composite will be installed. The new third rail design will pro- vide less resistance for 8-car trains and save energy. Metro uses a continuous welding process to rehabilitate track which reduces the number of open rail joints throughout the rail system, requires less maintenance than mechanical s p l i c e s , i m p r o v e s t h e e l e c t r i c a l c o n d u c t i v i t y o f t h e r a i l , e l i m i n a t e s j o i n t d e f e c t s
and eliminates cross tie fires. Metro continually strives to identify strategies that save capital and operating dollars.
Track rehabilitation projects also maintain the integrity of structures (e.g., aerial bridges and retaining walls) by repairing masonry, drainage systems, tensioning cables and expansion joints. Many of Metro’s structures have been in service between 20 - 30 years and have been subjected to extreme environ- mental conditions. By rehabilitating structural components, Metro maintains the integrity of these dynamically loaded Right-of-Way structures and restores the structures to their designed load carrying capacity.
Concrete pads (or grout/plinth pads) located below the track are another key structural component addressed under track rehabilitation projects. Concrete pads provide elevation and support for the track and track fasteners. Other pads, called floating slab isolation pads, dissipate vibration energy and are
replaced as needed to restore the track structure to the proper elevation. Im- proper elevation can result in damage to the car’s third rail collector shoes and the vibrations can potentially lead to structural cracking in the surrounding buildings and structures. Metro’s Track Rehabilitation projects total $540 mil- lion over the next 10 years.
Track Rehabilitation includes the following CNI projects:
CNI Project CNI 024: Track Rehabilitation CNI 023: Third Rail Rehabilitation
Total (YOE, $ Millions) $387.2 $40.2
Many of Metro’s structures have been in service between 20 - 30 years and have been subjected to extreme environmental conditions.
Investment Category: Performance 47